Lab 05 Blood Pressure Lab Lecture.pdf

Lab 05 Blood Pressure Lab Lecture.pdf - BLOOD PRESSURE...

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BLOOD PRESSURE
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Mastering Reminders This is only an outline of the material you should have gone through in the interactive lectures, Remember to click on the links in the mastering items and complete the lecture material . You need to know all of that material not just what is in this slide show. Reminder: Do NOT use the “give up” button you will loose the points for the assignment. Ask if you are stuck-
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Blood Pressure (BP) = The force that blood exerts against blood vessel walls BP = CO X TPR Cardiac Output (CO) : The amount of blood pumped by each ventricle in one minute (From Cardiac lab) Total Peripheral Resistance (TPR) : The resistance caused by blood cells and plasma contacting the blood vessel walls If increased more pressure is needed to keep blood moving Blood Pressure:
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Factors affecting Total Peripheral Resistance Vessel diameter - Constriction of blood vessels increases TPR - Dilation of blood vessels decreases TPR Blood Viscosity - Increase in blood viscosity (such as in polycythemia) increase TPR Total vessel length The longer the length of the vessels the higher the TPR
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Factors affecting Total Peripheral Resistance So if your Hematocrit increases how might that affect your blood Pressure What does this mean? Increased Red blood cells to Plasma ratio so the blood is ……. Thicker (More Viscous) Blood Viscosity TPR BP = CO X TPR BP
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Cardiac Output affects on Blood Pressure The Interactive lecture: “Factors that affect blood pressure” explains this in detail make sure you go through and understand that lecture these slides are not all you need to know BP = CO X TPR cardiac output heart rate Blood pressure CO = HR X SV
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Control of BP in the Brain The medulla oblongata houses both the cardioregulatory center and the respiratory regulatory center. Receptors in the blood vessels and a specific area of the CNS send signals to these centers to maintain homeostasis
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Blood Pressure Regulation: Baroreceptors : Regulate Blood pressure Sense changes in pressure in the blood vessels Found in Carotid sinus, Aortic arch and arteries in the neck and thorax Send afferent messages to the medulla oblongata regarding vessel pressure Medulla oblongata: Sends efferent signals to the peripheral blood vessels and heart in response to maintain homeostasis
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